centos7安装 mysql5.7(安装包)

一. 卸载centos7自带数据库

1. 查看系统自带的Mariadb

rpm -qa|grep mariadb

mariadb-libs-5.5.44-2.el7.centos.x86_64

2. 卸载

rpm -e --nodeps mariadb-libs-5.5.44-2.el7.centos.x86_64

3. 删除etc目录下的my.cnf

rm /etc/my.cnf

二.检查mysql是否存在(有就卸载,删除相关文件)

rpm -qa | grep mysql

三. 检查mysql组合用户是否存在(无则创建)

cat /etc/group | grep mysql

cat /etc/passwd | grep mysql 

创建用户组/用户相关链接

四. 下载安装包

五.安装

1. 解压到/usr/local/

tar -zxvf  mysql-5.7.24-linux-glibc2.12-x86_64.tar.gz  -C /usr/local

2. 重命名

mv mysql-5.7.24-linux-glibc2.12-x86_64.tar.gz mysql

3. 更改所属的组和用户

cd /usr/local/
chown -R mysql mysql/
chgrp -R mysql mysql/
cd mysql/
mkdir data
chown -R mysql:mysql data

4. 在/etc下创建my.cnf文件

# 进入/usr/local/mysql文件夹下
cd /usr/local/mysql

# 创建my.cnf文件
touch my.cnf 

# 编辑my.cnf
 vim my.conf

5. my.cnf 内容

[mysql]
socket=/var/lib/mysql/mysql.sock
# set mysql client default chararter
default-character-set=utf8

[mysqld]
socket=/var/lib/mysql/mysql.sock
# set mysql server port  
port =3306
# set mysql install base dir
basedir=/usr/local/mysql
# set the data store dir
datadir=/usr/local/mysql/data
# set the number of allow max connnection
max_connections=200
# set server charactre default encoding
character-set-server=utf8
# the storage engine
default-storage-engine=INNODB
lower_case_table_names=1
max_allowed_packet=16M
explicit_defaults_for_timestamp=true

[mysql.server]
user=mysql
basedir=/usr/local/mysql

6. 进入mysql文件夹，并安装mysql

# 进入mysql
 cd /usr/local/mysql

# 安装mysql
bin/mysql_install_db --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data/

7. 设置文件及目录权限
   cp ./support-files/mysql.server /etc/init.d/mysqld
   chown 777 my.cnf
   chmod +x /etc/init.d/mysqld

8. 启动mysql

service mysqld start

错误一

MySQL server PID file could not be found![FAILED]
Starting MySQL.Logging to '/usr/local/mysql/data/CDH-141.err'.
..The server quit without updating PID file (/usr/local/mysql/data/CDH-141.pid).[FAILED]

我的错误解决方法(可能会别的原因,请按实际情况处理)

mkdir   /var/lib/mysql
chmod 777  /var/lib/mysql

== 错误二==

-bash: mysql: command not found

我的错误解决方法—>建立软连接

ln -s /usr/local/mysql/bin/mysql  /usr/bin

错误三

Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

我的错误解决方法(可能会别的原因,请按实际情况处理)

find / -name mysql.sock
#我找到的位置  /var/lib/mysql/mysql.sock  
ln -s    /var/lib/mysql/mysql.sock    /tmp

后续修改密码什么的自己百度